Financing Arrangements - Summary of Covenants under Credit Agreement (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2014
Debt Disclosure [Abstract]
Annual capital expenditures limit	$ 4,000
Annual dividend to shareholders limit	$ 1,250

Credit agreement covenant maximum annual capital expenditures.

No definition available.

Name:	cobr_CreditAgreementCovenantMaximumAnnualCapitalExpenditures
Namespace Prefix:	cobr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant